On Mar 16, 2013, at 16:08, Paul Birkel <pbirkel at gmail.com> wrote:
The other board has KEMET axial capacitors that are bullet-shaped and solid
plastic. I've never seen anything like them before. Has anyone else?
Searching through parts sheets @Mouser it looks like this is a
*tantalum *capacitor
(but apparently a discontinued line). One of these smoked mightily on
power-up, splitting across the middle. (Fortunately this seems like a
non-fatal failure as regards the remainder of the circuitry.)
I definitely have some I was using as the cathode resistor
bypass for a tube amp. They still exist and are manufactured.
I'm unsure whether there's any good reason to
replace it with a small
electrolytic as used on the first board (and, perhaps, all of the others
like it on the board), or whether I should replace *just* it with another
KEMET capacitor instead?
I'd at least stick with tantalums of some sort, since the lower
ESR may be important.
Since no other KEMET capacitors failed (there are 17
others) I'm thinking
that I should replace *just *it, and with a comparable modern KEMET
tantalum capacitor; *e.g*., the T110B156M020AT
Does anyone have any experience with this part, repairing boards where this
part has failed, or other words-of-wisdom to offer?
Doesn't have to be KEMET, but they are one of the two
major manufacturers of tantalum electrolytics. The other
is AVX; there are others, but those are the two I end up
building into boards.
- Dave